🛡️ CVE-2025-4947 — curl

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-295 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2025-4947 is classified as CWE-295: Improper Certificate Validation. A TLS certificate is accepted without proper verification, so a man-in-the-middle can present their own.

Affected software

CVE-2025-4947 is recorded against 1 package.

  • curl (from 8.8.0 up to 8.14.0)

Timeline and source

Published on 28 May 2025 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

curl.se
curl.se
hackerone.com
www.openwall.com

CVE-2025-4947 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE CWE-295
Public Exploit ⚠️ Yes
Source NVD
Published 2025-05-28
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
curl 8.8.0 8.14.0

References

Exploit, Issue Tracking, Patch https://hackerone.com/reports/3150884
Mailing List, Patch, Third Party Advisory http://www.openwall.com/lists/oss-security/2025/05/28/4

Exploit Protection

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CVE-2025-4947 carries CVSS 6.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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